Prominent U.S. conservatives want the Obama administration to "take immediate action" against the Syrian regime, including "no-go zones" for President Bashar al-Assad's military and "self-defense aid" to resistance forces.

Fifty-six foreign policy experts and former U.S. government officials signed a letter dated Friday calling for proactive U.S.-led steps against the government. It comes as Syrian citizens and activists plead for world powers to help stop the government's bloody crackdown.

They include Karl Rove, the former Bush administration adviser; Paul Bremer, in charge of the U.S. occupation in Iraq after the 2003 invasion; R. James Woolsey, former CIA chief; Robert McFarlane, former Reagan national security adviser, and Dan Senor, a former Bremer adviser and spokesman for the Coalition Provisional Authority in Iraq.

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CNN's Security Clearance examines national and global security, terrorism and intelligence, as well as the economic, military, political and diplomatic effects of it around the globe, with contributions from CNN's national security team in Washington and CNN journalists around the world.